So, what do _you_ do when you witness a hit-and-run? Leave a note? Curse under your breath? “Snap a photo and print posters for the whole neighborhood”:http://www.powazek.com/2005/07/000534.html? A little luck and a little technology helped Derek Powazek go straight for the posters, and I personally hope this is a prelude to a “transparent society”:http://www.davidbrin.com/tschp1.html.